c# - How to change the contrast of an image using emgu -


i trying improve quality of image.

i use emgu this.

i use code change contrast (i think!).

image<bgr, byte> improveme = new image<bgr, byte>(grid); improveme._equalizehist();

for daytime image this:

enter image description here

for night time image this:

enter image description here

obviously, not good!

the 1st image nice , lush , 2nd can see descirbed over-exposed.

are there ways avoid such poor image @ night-time? because image lower in color channels (if makes sense)? should check min/max color ranges of image before deciding apply filter? should use different filter?

reading material links welcome answers well...

there many ways better others depending whether video feed, still , camera shutter speed... , on.

i recommend try "adaptive threshold" (emgu thresholdadaptive function) , check white balance algorithms. check one: white balance algorithm


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